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Model reduced-order calculation method of parallel NTFA theory based on ABAQUS

A calculation method and model reduction technology, applied in the field of composite material simulation, can solve problems such as high calculation efficiency, complex model structure, and many variables, achieve high precision and improve calculation efficiency

Pending Publication Date: 2021-08-06
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0006] In order to solve the shortcomings of the existing technology, a model reduction calculation method based on ABAQUS's parallel NTFA (uniform transition field analysis) theory is provided. This aspect has high calculation efficiency and is more suitable for solving projects with complex model structures and many variables. question

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  • Model reduced-order calculation method of parallel NTFA theory based on ABAQUS
  • Model reduced-order calculation method of parallel NTFA theory based on ABAQUS
  • Model reduced-order calculation method of parallel NTFA theory based on ABAQUS

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Embodiment Construction

[0025] With reference to the accompanying drawings, a model reduction calculation method based on ABAQUS's parallel NTFA theory adopts the following steps:

[0026] Step 1, use Fortran language programming to realize the construction of the three-dimensional RVE mesoscopic model, so that spherical particles with different diameters are randomly generated, and they are all randomly distributed in the RVE. During the model building process, the spherical particles are placed in the RVE in batches, and at the same time, check whether the particles intersect. If they intersect, they are removed, and then the spherical particles are re-inserted until the required volume fraction is met.

[0027] Step 2, using multiple user-defined subroutine interfaces to carry out secondary development of ABAQUS, realize the uniform calculation of mesoscopic RVE, and make necessary preparations for the subsequent nonlinear coupling multi-scale analysis; Define the subroutine UEXTERNALDB to read th...

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Abstract

A model reduced-order calculation method of a parallel NTFA theory based on ABAQUS comprises the steps of firstly constructing a three-dimensional RVE mesoscopic model; based on ABAQUS secondary development, utilizing a restart analysis function of ABAQUS, introducing a macroscopic false model, providing a parallel multi-scale coupling calculation method; based on initial space-time dependency of plastic strain, performing decomposition calculation on the initial space-time dependency, obtaining a system matrix through MATLAB programming, and carrying out secondary development on the ABAQUS, reading RVE plastic information obtained in the offline analysis stage of the mesoscopic model, and simultaneously solving and calculating the macroscopic model and the mesoscopic RVE in combination with a parallel double-scale theory. According to the method, on the premise that high precision is guaranteed, the problems existing in the prior art are well solved, and when the engineering problems of complex model structure and many variables are calculated, the calculation efficiency can be effectively improved through the method.

Description

technical field [0001] The invention relates to the technical field of composite material simulation, in particular to a model reduction calculation method based on ABAQUS parallel NTFA theory. [0002] technical background [0003] With the advancement of science and technology, composite materials are more and more used in aerospace, automobile industry, chemical industry, etc. , textile and machinery manufacturing, medicine and other fields. Therefore, the research on the structure and performance of composite materials is becoming more and more urgent and necessary. [0004] However, composite material is a kind of anisotropic heterogeneous material. When using the existing finite element software to simulate it, the calculation amount is too large and the calculation waiting time is too long due to the excessive number of grids, which makes the Work efficiency is reduced and the progress of the project is too slow. [0005] At present, the homogenization method and mu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F113/26
CPCG06F30/23G06F2113/26
Inventor 朱加文许杨剑徐学聪王效贵梁利华
Owner ZHEJIANG UNIV OF TECH
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